.NET MAUI reference

builder.UseFacePing(o =>
{
    o.SandboxKey = "fp_test_…";                 // sandbox: faces enrolled on the device
    // o.DeviceToken = "fpd_…";                 // production: faces synced from your group or event
    // o.ApiBaseUrl = new("https://api-eu.faceping.ai/");
});

public interface IFacePing
{
    bool IsSandbox { get; }
    IReadOnlyCollection<string> EnrolledIds { get; }

    Task<EnrolResult> EnrolAsync(string id, FaceImage photo, CancellationToken ct = default);
    Task<VerifyResult> VerifyLiveAsync(string id, FaceCameraView camera, CancellationToken ct = default);
    Task<VerifyResult> VerifyAsync(string id, FaceImage photo, CancellationToken ct = default);

    Task<bool> ForgetAsync(string id);
    Task ForgetAllAsync();

    Task<SyncResult> SyncAsync(CancellationToken ct = default);   // production
    event EventHandler<SyncResult>? Synced;                         // production
}

<fp:FaceCameraView x:Name="Camera" HeightRequest="420" />

public record EnrolResult(EnrolOutcome Outcome, string Id);

public enum EnrolOutcome
{
    Enrolled, NoFace, MultipleFaces, FaceTooSmall, NotLive, LimitReached
}

public record VerifyResult(
    VerifyOutcome Outcome,
    double Similarity,
    double? LivenessScore,
    TimeSpan Elapsed,
    bool IsSandbox);

public enum VerifyOutcome
{
    Match, NoMatch, NotEnrolled, NoFace, LivenessFailed, ChallengeFailed, Expired, LeaseExpired
}